Anthropic acquires Stainless, a startup known for SDK development tools used by AI firms

May 18, 2026

AI Summary

Anthropic has acquired Stainless, a startup that automates the creation of software development kits (SDKs) for AI applications. The deal, reportedly valued at over $300 million, will restrict access to Stainless's technology, previously utilized by competitors like OpenAI and Google.

Anthropic announced the acquisition of Stainless, a startup founded by Alex Rattray in 2022, known for its SDK development tools.
The financial terms of the deal were not disclosed, but reports suggest it was valued at over $300 million.
Stainless's technology automates the creation and maintenance of SDKs, which are essential for developers to interact with APIs.
The acquisition will limit access to Stainless's tools for Anthropic's competitors, as the company plans to wind down all hosted Stainless products.
Stainless customers will retain ownership of the SDKs they have generated and can modify them as needed.
Rattray emphasized the importance of SDKs in relation to APIs and expressed enthusiasm about collaborating with Anthropic.

acquisitionstartupdev toolscloud computingtechnology

Anthropic acquires Stainless, a startup known for SDK development tools used by AI firms

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